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Supplementary Oil and Gas Information (Net Proved Reserves) (Details)
 12 Months Ended
Dec. 31, 2025
MMBbls
Bcf
Dec. 31, 2024
MMBbls
Bcf
Dec. 31, 2023
MMBbls
Bcf
Reserve Quantities [Line Items]      
Beginning of year 2,057.1 2,185.9 2,273.6
Revisions and improved recovery 198.2 (217.9) (309.6)
Extensions and discoveries 138.9 300.1 285.3
Purchase of reserves in place 311.8 4 243.9
Sale of reserves in place (156.6) (1) (100.8)
Production (224.3) (214.1) (206.5)
End of year 2,325.1 2,057.1 2,185.9
Developed 1,493.7 1,207.1 1,345.6
Undeveloped 831.3 850 840.2
Oil [Member]      
Reserve Quantities [Line Items]      
Beginning of year 580 518.9 535.3
Revisions and improved recovery (29.8) 2.9 (134)
Extensions and discoveries 19.6 118.3 64.7
Purchase of reserves in place 33.3 1.8 160
Sale of reserves in place (108.2) (0.3) (49.1)
Production (52.1) (61.5) (58)
End of year 442.7 580 518.9
Developed 240.8 274 277.7
Undeveloped 201.9 306 241.2
Natural Gas Liquids [Member]      
Reserve Quantities [Line Items]      
Beginning of year 634.2 525.3 606.9
Revisions and improved recovery 20.9 85.4 (95.4)
Extensions and discoveries 19.7 71.8 43.6
Purchase of reserves in place 125.8 1 47.7
Sale of reserves in place (14.9) (0.4) (28.9)
Production (58.9) (48.9) (48.6)
End of year 726.8 634.2 525.3
Developed 470.5 396.1 353.7
Undeveloped 256.4 238.2 171.6
Natural Gas [Member]      
Reserve Quantities [Line Items]      
Beginning of year | Bcf 5,057 6,850 6,789
Revisions and improved recovery | Bcf 1,243 (1,837) (482)
Extensions and discoveries | Bcf 598 660 1,061
Purchase of reserves in place | Bcf 916 7 218
Sale of reserves in place | Bcf (201) (2) (137)
Production | Bcf (680) (621) (599)
End of year | Bcf 6,933 5,057 6,850
Developed | Bcf 4,695 3,222 4,286
Undeveloped | Bcf 2,238 1,835 2,565
United States [Member] | Oil [Member]      
Reserve Quantities [Line Items]      
Beginning of year 579.8 518.8 535.2
Revisions and improved recovery (29.9) 2.9 (134)
Extensions and discoveries 19.6 118 64.7
Purchase of reserves in place 33.3 1.8 160
Sale of reserves in place (108.2) (0.3) (49.1)
Production (52) (61.4) (58)
End of year 442.5 579.8 518.8
Developed 240.6 273.7 277.6
Undeveloped 201.9 306 241.2
United States [Member] | Natural Gas Liquids [Member]      
Reserve Quantities [Line Items]      
Beginning of year 534.5 378.4 457.8
Revisions and improved recovery 10.1 129.1 (89.1)
Extensions and discoveries 13.6 58.2 23.3
Purchase of reserves in place 24.3 1 46.6
Sale of reserves in place (14.9) (0.4) (28.9)
Production (31.9) (31.8) (31.2)
End of year 535.8 534.5 378.4
Developed 364.9 336.2 275.7
Undeveloped 170.9 198.4 102.7
United States [Member] | Natural Gas [Member]      
Reserve Quantities [Line Items]      
Beginning of year | Bcf 3,052 2,259 2,698
Revisions and improved recovery | Bcf 190 639 (460)
Extensions and discoveries | Bcf 69 346 146
Purchase of reserves in place | Bcf 119 6 201
Sale of reserves in place | Bcf (201) (2) (137)
Production | Bcf (188) (197) (189)
End of year | Bcf 3,041 3,052 2,259
Developed | Bcf 2,123 1,953 1,695
Undeveloped | Bcf 919 1,099 564
Canada [Member] | Oil [Member]      
Reserve Quantities [Line Items]      
Beginning of year 0.2 0.1 0.1
Revisions and improved recovery 0.1 0.1 0
Extensions and discoveries 0 0.3 0
Purchase of reserves in place 0 0 0
Sale of reserves in place 0 0 0
Production (0.2) (0.1) 0
End of year 0.2 0.2 0.1
Developed 0.2 0.2 0.1
Undeveloped 0 0 0
Canada [Member] | Natural Gas Liquids [Member]      
Reserve Quantities [Line Items]      
Beginning of year 99.7 146.9 149
Revisions and improved recovery 10.8 (43.7) (6.2)
Extensions and discoveries 6.1 13.6 20.4
Purchase of reserves in place 101.5 0 1.1
Sale of reserves in place 0 0 0
Production (27.1) (17.1) (17.4)
End of year 191.1 99.7 146.9
Developed 105.6 59.9 78
Undeveloped 85.5 39.8 68.9
Canada [Member] | Natural Gas [Member]      
Reserve Quantities [Line Items]      
Beginning of year | Bcf 2,005 4,591 4,090
Revisions and improved recovery | Bcf 1,053 (2,476) (21)
Extensions and discoveries | Bcf 529 315 916
Purchase of reserves in place | Bcf 797 1 17
Sale of reserves in place | Bcf 0 0 0
Production | Bcf (492) (425) (411)
End of year | Bcf 3,892 2,005 4,591
Developed | Bcf 2,572 1,269 2,590
Undeveloped | Bcf 1,319 736 2,000